#pragma once
#include <elasticlient/client.h>
#include <cpr/cpr.h>
#include <json/json.h>
#include <iostream>
#include <memory>
#include <vector>
#include <string>
#include <sstream>
#include "logger.hpp"

namespace suye
{
bool Serialize(const Json::Value& val, std::string *out)
{
    // 先定义一个StreamWriterBuilder对象，用于构造StreamWriter对象
    Json::StreamWriterBuilder swb;
    swb.settings_["emitUTF8"] = true;
    std::unique_ptr<Json::StreamWriter> sw(swb.newStreamWriter());
    // 通过Json::StreamWriter对象中的write接口进行序列化
    std::stringstream ss;
    if (sw->write(val,& ss) != 0) {
        std::cout << "序列化失败!" << std::endl;
        return false;
    }
    *out = ss.str();
    return true;
}

bool Unserialize(const std::string& in, Json::Value *val)
{
    // 先定义一个CharReaderBuilder对象，用于构造CharReader对象
    Json::CharReaderBuilder crb;
    std::unique_ptr<Json::CharReader> cr(crb.newCharReader());
    // 通过Json::CharReader对象中的parse接口进行反序列化
    std::string errs;
    if (cr->parse(in.c_str(), in.c_str() + in.size(), val,& errs) == false) {
        std::cout << "反序列化失败!" << std::endl;
        return false;
    }
    return true;
}

class ESIndex
{
public:
    ESIndex(std::shared_ptr<elasticlient::Client>& client,
            const std::string& name,
            const std::string& type = "_doc")
        : _name(name), _type(type), _client(client)
    {
        Json::Value analysis;
        Json::Value analyzer;
        Json::Value ik;
        Json::Value tokenizer;
        tokenizer["tokenizer"] = "ik_max_word";
        ik["ik"] = tokenizer;
        analyzer["analyzer"] = ik;
        analysis["analysis"] = analyzer;
        _index["settings"] = analysis;
    }

    ESIndex& append(const std::string& key,
                    const std::string& type = "text",
                    const std::string& analyzer = "ik_max_word",
                    bool enabled = true)
    {
        Json::Value fields;
        fields["type"] = type;
        fields["analyzer"] = analyzer;
        if (enabled == false)
            fields["enabled"] = enabled;
        _properties[key] = fields;

        return *this;
    }

    bool create(const std::string& index_id = "default_index_id")
    {
        Json::Value mappings;
        mappings["dynamic"] = true;
        mappings["properties"] = _properties;
        _index["mappings"] = mappings;

        std::string body;
        if (!Serialize(_index,& body)) {
            LOG_ERROR("索引序列化失败!");
            return false;
        }
        // LOG_INFO("{}", body);

        // 发起搜索请求
        try {
            auto rsp = _client->index(_name, _type, index_id, body);
            if (rsp.status_code < 200 || rsp.status_code >= 300) {
                LOG_ERROR("创建ES索引{}失败, 响应状态码异常: {}", _name, rsp.status_code);
                return false;
            }
            std::cout << "status code: " << rsp.status_code << std::endl;
            std::cout << "response body: " << rsp.text << std::endl;
        } catch (const std::exception& e) {
            LOG_ERROR("创建ES索引{}失败: {}", _name, e.what());
            return false;
        }

        return true;
    }

private:
    std::string _name;
    std::string _type;
    Json::Value _properties;
    Json::Value _index;
    std::shared_ptr<elasticlient::Client> _client;
};

class ESInsert
{
public:
    ESInsert(std::shared_ptr<elasticlient::Client>& client,
                const std::string& name,
                const std::string& type = "_doc")
        : _name(name), _type(type), _client(client) {}

    template<typename T>
    ESInsert &append(const std::string &key, const T &val){
        _item[key] = val;
        return *this;
    }

    bool insert(const std::string& id = "")
    {
        std::string body;
        if (!Serialize(_item,& body)) {
            LOG_ERROR("索引序列化失败!");
            return false;
        }
        // LOG_INFO("{}", body);

        try {
            auto rsp = _client->index(_name, _type, id, body);
            if (rsp.status_code < 200 || rsp.status_code >= 300) {
                LOG_ERROR("新增数据{}失败, 响应状态码异常: {}", body, rsp.status_code);
                return false;
            }
        } catch (const std::exception& e) {
            LOG_ERROR("新增数据{}失败: {}", body, e.what());
            return false;
        }

        return true;
    }

private:
    std::string _name;
    std::string _type;
    Json::Value _item;
    std::shared_ptr<elasticlient::Client> _client;
};

class ESRemove
{
public:
    ESRemove(std::shared_ptr<elasticlient::Client>& client,
                const std::string& name,
                const std::string& type = "_doc")
        : _name(name), _type(type), _client(client) {}

    bool remove(const std::string& id)
    {
        try {
            auto rsp = _client->remove(_name, _type, id);
            if (rsp.status_code < 200 || rsp.status_code >= 300) {
                LOG_ERROR("新增数据{}失败, 响应状态码异常: {}", id, rsp.status_code);
                return false;
            }
        } catch (const std::exception& e) {
            LOG_ERROR("新增数据{}失败: {}", id, e.what());
            return false;
        }

        return true;
    }

private:
    std::string _name;
    std::string _type;
    std::shared_ptr<elasticlient::Client> _client;
};

class ESSearch
{
public:
    ESSearch(std::shared_ptr<elasticlient::Client>& client,
                const std::string& name,
                const std::string& type = "_doc")
        : _name(name), _type(type), _client(client)
    {
    }

    ESSearch& append_must_not_terms(const std::string& key, const std::vector<std::string>& vals)
    {
        Json::Value fields;
        for (const auto& val : vals) {
            fields[key].append(val);
        }
        Json::Value terms;
        terms["terms"] = fields;
        _must_not.append(terms);
        return *this;
    }

    ESSearch& append_must_term(const std::string& key, const std::string& val)
    {
        Json::Value field;
        field[key] = val;
        Json::Value term;
        term["term"] = field;
        _must.append(term);
        return *this;
    }

    ESSearch& append_should_match(const std::string& key, const std::string& val)
    {
        Json::Value field;
        field[key] = val;
        Json::Value match;
        match["match"] = field;
        _should.append(match);
        return *this;
    }

    ESSearch& append_must_match(const std::string& key, const std::string& val)
    {
        Json::Value field;
        field[key] = val;
        Json::Value match;
        match["match"] = field;
        _must.append(match);
        return *this;
    }

    Json::Value search()
    {
        Json::Value cond;
        if (!_must_not.empty())
            cond["must_not"] = _must_not;
        if (!_should.empty())
            cond["should"] = _should;
        if (!_must.empty())
            cond["must"] = _must;
        Json::Value query;
        query["bool"] = cond;
        Json::Value root;
        root["query"] = query;

        std::string body;
        if (!Serialize(root,& body)) {
            LOG_ERROR("索引序列化失败!");
            return Json::Value();
        }
        // LOG_DEBUG("{}", body);

        // 发起搜索请求
        cpr::Response rsp;
        try {
            rsp = _client->search(_name, _type, body);
            if (rsp.status_code < 200 || rsp.status_code >= 300) {
                LOG_ERROR("检索数据{}失败, 响应状态码异常: {}", body, rsp.status_code);
                return Json::Value();
            }
        } catch (const std::exception& e) {
            LOG_ERROR("检索数据{}失败: {}", body, e.what());
            return Json::Value();
        }

        // 需要对响应结果进行反序列化
        Json::Value json_res;
        if (!Unserialize(rsp.text,& json_res)) {
            LOG_ERROR("检索数据{}结果反序列化失败!");
            return Json::Value();
        }

        return json_res["hits"]["hits"];
    }

private:
    std::string _name;
    std::string _type;
    Json::Value _must_not;
    Json::Value _should;
    Json::Value _must;
    std::shared_ptr<elasticlient::Client> _client;
};
}